Primary pneumatic valve.



iNo. 835,775. PATENTED NOV. 13, 1906.

' G. P. BRAND.

- PRIMARY PNEUMATIC VALVE.

APPLICATION FILED JAILSI. 1905.

I I1 2221;: flew W EZE i i PATENT OFFICE.

GEORGEP. BRAND, OF NEW YORK, N.

PRIMARY PNEUMATIC VALVE.

Specification of Letters Patent.

Patented Nov. 13,190

bpplication filed January 31,1905. Serial No. 243,464.

To all, whom, it may concern.

Be it known that I, GEORGE P. BRAxD,.a citizen of the United States, residing in the city of New York, borough of Manhattan,

county and State of New York, have invented certain new and useful Improvements in Primary Pneumatic Valves, of which the following is'a specification sufficient to enable others skilled in the art to which the invention appertains to make and use the same.

My invention relates to what are known as primary valves for use in pneumatic apparatus and is designed to afi'ord means whereby the two valvesmay be mounted upon and adjusted, tested, and regulated with accuracy with relation to their seatson the common valve-seat, body prior to the insertion of'said valve-seat body into the valveboard. Heretot'ore such valves have been mounted directly 'and individually in the valve-board and after all were so mounted had all to be tested simultaneously, rendering leak was very perceptible.

get all-of the individual valves in a valveboard absolutely tight under such conditions. I obviate this difficulty and save much time,

labor, and expense inthe-operation ot' fvalving bythe use of an independent, adjustable, interchangeablejand detachable duplex valve-seat body, to which the valves may be quickly and conveniently applied and set iii-readiness to be inserted in the valveboardat any time without further adjustment or regulation insofar as the relation of the valves to their seats is concerned. Furthermore; Isecure each of my duplex pri-- mary valve-seat bodies and valves in positi'o'n in the valveboard without the aid of extraneous appliances, such as screws or the like, each being preferably so formed externally that it may be readily driven into'anyof a series of suit-able bores formed for its reception in and. through the valve-board.

, My invention also includes certain other details of construction, hereinafterdescribed and claimed specificall I herein-show myduplex primary valveseat and valves as arranged vertically and as a matter of convenience describe them in Ithatposition, it being understood that" I do not myself in this respect and that the'y may be arranged horizontally or at any intermediate angle, ifdesired.

In the accompanying drawings, Figure 1 is a sectional elevation illustrating the practical application of one of my duplex primary valve-seat bodies and its valves to pneumatic. chest work of well-known construction.' Fig. 2 is an elevation of the upper end of the duplex-seat-body; Fig. 3, a side elevation of the same. Fig. 4 is a central vertical section upon plane of. line 4 4, Fig. 3. Fig. 5 is a transverse section upon plane of line 5 5 Fig. 4., Fig. 6 is a detail view'of one of the guides. Fi 7 is a sectional detail of the butt va ve, showing modifications in the the duplex valve-bod ig. 10 is a top view of a modified form of duplex valve-seat body; Fig. 11, a sectiontaken upon plane of line 11' line 14 14, Fig. 11. Figs.-15 and 16 are sectional views illustrating modifications of structure. I

' The above views-show the parts upon a practice, so as to facilitate illustration.

show the relation of my duplex primary valve-seat body to adjoining parts, A being the valve-board consisting of a single solid a and theduct or port a, leading to a pneumatic, and B the bottom board or portion of the chestwork containing the tension-chamber C, tracker-board duct 0, bleed b, and

essentially or substantially cylindrical in the may be made to taper. or converge slightly (say one eight-thousandth .of an inch, more or less) or may be cylindrical for three-fourths or more of its length. In either case the lower edges i s;chamfered, beveled, or rounded off or otherwisereduced in diameter as com ared with the main portion of the body to aciliin the valve-board A forits'reception, said means of adjustment. Figs. 8 and 9 show peripheral structure of y.

11, Fig. 10; Fig. 12, a section taken upon planeof line 12 12, Fig. 10; Fig. 13, a section taken upon plane of line 13 13, Fig. 11; Fig.. 14, a transverse section taken upon plane of piece in which is formed the cylindrical bore' duct 0, and the diaphragm d and its cham- The duplex valveaseat body S is preferably though not necessarily made of metal and is.

scale larger than that usually employed in Only suflicient of the pneumatic chest- 'work is indicated symbolically herein, to

main, Forinstance, its peripheral surface s 'tate its introduction into the'bore (Lg-formed pitch or conical taper being, however, neces In Fig; 16 still. another modification of peripheral structure I is shown in which the duplex seat-body has sarily exaggerated therein.

a cylindrical portion formed with a relatively fine screw-thread 8 In this case if a suflicientlyfine peripheral male screw-thread is formed upon the duplex seat-body it may be relied upon toform its own female screwthread by displacement of the material comthe parts. j

Where the peripheral screw-thread is posing the surface of the bore a, thereby forming a very tight compact joint between formed upon the duplex seat-body, the latter is formed with key-nicks s ore uivalent means for engagement with a suita 1e driving-tool. One advantage of the peripheral screw-thread is that it enables me-to either insert or withdraw the duplex seat-body with-' out removing the valve-board from the'bottom board B, and, furthermore, and more important still, itenables me by external means and without removing the parts to adjust the internal relation of the lower end of the valve rod 7" or its butt r with accuracy with relation to the diaphragmd. When it is considered that in practice the throw or play of the valves is only approximately one thirty-second of an inch, the necessity for delicacy of adjustment in this respect is obvious, since any deviation from an exact adjustment of the butt r and valve-rod 'r with relation to the diaphragm d would interfere with the proper action of the latter.

The upper and lower extremities of the duplex valve-body S are each formed with a valve-seat .9 preferably annular in form, for seating the valves '22 i), which are mounted adjustably upon the. valve-rod 1'. Instead of being in the form of projecting annular flanges, as showri'in all of the 'figures of the drawings exceptFig. 16, saidseats s may he flush with the ends of the duplex seat-body S, as shown in said Fig. 16, if preferred.

The butt?" on the inner end of the valverod 7' for contact with the diaphragm d may ing this form of duplex seat-body the valves v '0 are first adjusted upon the valve-stem 1' with relation to each other, so as to aflord the requisite extent of play or motion with relation to their seats, and the butt 7" is then so as to fully seat the latter wheir the diaphragm d is deflated. In the absence of the adjusted with .relationto the upper valve 1),

shoulders s 'the adjustment of the valves '0 'v and the butt T when the latter is practically integral with the lower valve 1), as in the other figures of the drawings, is effected by first adjusting the upper valve 1) approximately upon the stem 1", the lower valve 12 and butt 7" being adjusted upon the inner end of the rod 7' to limit and prescribe the degree of valve movement or play, and the butt r is then adjusted with relation to the diaphragm d by regulatin the position of the duplex seat-body S wit in the bore so as'to seat the upper valve 'v' squarely when the diaphragm is deflated. By providing as herein set forth for the accurate adjustment of the butt 7" with relation to the outer valve 2 and the diaphragm d when deflated I' am enabled to" compensate for inevitable variations in construction no matter how slight the same may be, and thus insure the prompt action of the valves. Provision may be made for these adjustments in any suitable manner, as by"- male threads on the valve-rod, a female thread in the butt, and by the use of leather. washers in the usual manner and as illustrated in the accompanying drawings. The valve-rod 7" may also be guided and centralized b'y'any suitable means. Internal shoulders s s may be formed within the body of the duplex seat, against which may be forced close-fitting'guidespieces 9, having a central opening g for the passage of the valve-rod 1 and radial arms g g for engagement with the said shoulders 8 s and with the sides of the central longitudinal duct 8, as shown in Figs.

1 and 2, or in boring the air-duct s a central perforated core or sleeve 8 may be left for theguidance and support of the valve-rod, as

illustrated in Figs. 10 to 14, inclusive.

If preferred, the central longitudinal duct 3 in the seat-body S may be freeand unobstructed, and the valve-rod for a suitable por tion of its length may be made to fit said duct 8 loosely, so as to centralize the valves witho u t unduly impeding communication with the tension-chamber. In either casethe duplex. seat-body Sis formed with a lateral duct 8 for connecting the air-duct s with the pas+ sage a in the valve-boardA, by which commt nication is had with the pneumatic. The valve-body may also be formed with a peripheral annular groove 3', communicating with the lateral duct 3 so as to establish and maintain communication with the' passage d in the valve-board when thelateral duct 8 does not coincide with the said passage (1. This, admitsof the placing of the valve-body without special care and admits of the adjustment of the valve-body axially, as where ICO " air duct formed in the valve card.

the latter is formed with a peripheral screwthread, without obstructing communication with the pneumatic.

Reference has heretofore been made to the use of a suitable key .or instrument for driving the duplex seat-body S into the bore a when said body is formed with a peripheral screw-thread. In the other forms of peripheral structure a plain tubular instrument I may be used to drive the duplex seat-body S into or out of a bore a in the valve-board A, as indicated by dotted lines in Fig. 1, or any other implement that will insure a suitable distribution of pressure; it being understood '15 that th valve-board is first detached from the bottom board when it is desired to, drive a ily removed By. unscrewing it from'the bore by the use of means externally applied and without separat' the parts 'of the' chest 2 work. 1

v invention to secure by Lettersfli'atent, is

1.. In} pneumatic apparatus, the combination ofa soli one-piece valve-board formed What ,I claim asemy and desire o'witha smo h-surfaced cylindrical bore extendingthrough it,said board being also formed with an air-duct communicating laterallywith said cylindrical bore, and a detachable duplex valve-seat body adapted to 5 be driven without axialrotation into or out .of said cylindrical bore in the valve-board, said valve-seat body beingformed with an externalvalve-seat at each extremity with a central passage between said valve-seats and 0 with alateral port opening into said central passage and communicati vwith the said 2. In pneumatic apparatus the combination of a solid oneEpieceYalwfe-board formed 5 witha smooth-surfaced cylindrical bore extending through it,- said board being also formed 'with an air-duct communicating late'rally' with said cylindrical bore, and a de-c tachable duplex valve-seat body formed with so a smooth peripheral surface and adapted'to be driven without axial rotation into or out of said cylmdri'cal bore in "the valve-board,

said valve-seat body being formed with anexternal valve-seat at each extremity with a 5 5 central passage between said valve-seats and with a-lateral port opening into said central passage and communicatingwith the said airduct formed in the valve-board.

3. In pneumatic apparatus the combination of a. solid one-piece valve-board formedtending through it said board being also formed with anair-duct communicating laterallyiwith said cylindrical bore, and-a de-. tachable duplex valve-seat body formed with 'a smooth peripheral surface which is slightly convergent .toward its driving 'end,. the greater diameter of said valve-body being lindrical bore formed for its face tion in the,

with the' said air-duct formed 1 board,-for the purpose describedg! v g 4. In pneumatic apparatus, the combinawith a smooth-surfaced cylindric al bore ex-' tending through it, said board being also formed with an air-duct communicating laterally with; said cylindrical bore and a del tachable duplex valve-seat body formed with a smooth peripheral suriaceand adapted to be driven without axial rotation'into or out of said cylindrical bore in'tlie valVeTboard, said valve-seat body being formed with an externalvalve-seat at each extremity with a central passage between said valve-seats, and with a lateral port opening into said central passageand into an annular roove formed in the-periphery of 'the valveody,' said lateral pert'and said annular groove communieating with the said air-duct formed in the valve-body, for the purpose described.

- tion of abott'om'board formed with a tensionchamber, a diaphragm in said tension-cham her, a conduit communicatingon one side of said diaphragm with a source of intermittent formed with a smooth-surfaced cylindrical bore extending through it, said board being alsoforme'd with an air-duct communicating laterally with said 0 lindrical bore and with I a pneumatic, and a etachable duplex valveseatbody adapted to be driven without axial rotation into 'or' out of said cylindrical bore in; the valve-board, said valve-seat body being formed with an external valve-seat at each extremity with a central ass age be= tween said valve-seats'and with a lateral port opening into said central passage andcommunicating with the said air-duct-formed in the valve-board.

GEORGE P. BRAND. Witnesses:

GEo. WM. MIATT,

with a smooth-surfaced cylindrical bore ex- D. W. GARDNER.

slightly inexcess of the diameter of the cyvalve-board, 'saidvalve seat' ody being "adapted to be driven without axial rotation unicating tion of a solid one-piece valve-board formed 5. .Infpneumatic apparatus, the combina- IOC airsupply, a solid one-piece valve-board 

